JPH0410927Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention selectively opens and closes a large number of color change valves installed in a multicolor coating device according to a preprogrammed order in which each color paint is introduced. This invention relates to a color change valve opening/closing control mechanism.

[Conventional technology]

Conventional general color change valve opening/closing control mechanisms connect one control air supply pipe to each color change valve.
The color change valves are opened and closed by controlling the opening and closing of electromagnetic switching valves installed in each control air supply pipe.

However, in this case, a large number of expensive, large, and space-consuming electromagnetic switching valves must be installed in accordance with the number of color changing valves. In addition, the color change valve and the electromagnetic switching valve are electrically insulated for explosion-proof measures and to prevent the electromagnetic switching valve from being destroyed due to leakage of high voltage applied to the electrostatic coating machine. Therefore, the length of each control air supply pipe connected therebetween has to be extremely long.

Therefore, the equipment cost of the entire mechanism increases, the installation space becomes large, and maintenance and inspection are extremely troublesome.

Therefore, as shown in Japanese Unexamined Patent Publication No. 60-222162, the present applicant has attempted to reduce the equipment cost and installation space by reducing the number of control air supply pipes and the number of installed electromagnetic switching valves. A plurality of two-way branch paths are formed in a chain manner to conduct control air for opening and closing the color change valves, and the number of branch paths at the final stage corresponds to the number of color change valves.
We proposed a color change valve opening/closing control mechanism in which an air-operated piston valve is installed at the branch part of the directional branch to switch the control air flow path for each stage at once.

According to this, for example, when performing multi-color painting with 30 colors in the past, 32 control air supplies are connected to 32 color change valves, including the color change valves that supply cleaning air and cleaning thinner. Although pipes and 32 electromagnetic switching valves were required, only one control air supply pipe was required for opening and closing the color change valve, and apart from that, five two-way branch paths were formed in a chain to separate each valve. Since it is sufficient to provide a total of five control air supply pipes for opening and closing piston valves, one for each stage, and a total of five electromagnetic switching valves connected to each control air supply pipe, the control air supply The number of pipes and electromagnetic switching valves installed is significantly reduced.

[Problem that the invention attempts to solve]

However, if such a two-way branch path is formed in multiple stages and a piston valve is provided for each stage,
There is a problem in that the mechanism becomes large and heavy. Furthermore, it takes time for the control air to sequentially pass through the two-way branch paths of each stage and reach the color change valve, resulting in a problem that the response speed of the color change valve becomes slow. Furthermore, if even one of the piston valves provided at the branch portion of each two-way branch path fails or malfunctions, there is a problem in that the opening/closing control of the entire color change valve becomes impossible.

These problems have become a particularly serious problem in cases where six or more two-way branch paths are formed in a chain to form multi-color coatings of 50 or more colors, as in the case of automobile painting.

Therefore, the present invention aims to reduce the size and weight of the color change valve opening/closing control mechanism, improves the responsiveness of the color change valve, and also solves the problem that the opening/closing control of the entire color change valve becomes impossible due to a failure in one location. The aim is to eliminate the

[Means for solving problems]

In order to achieve this objective, the present invention provides a color change valve opening/closing control mechanism that selectively opens and closes a large number of color change valves provided in a multicolor painting device using control air. Air AND elements having a logical function of outputting air from one air output terminal only when air is input to both are arranged in rows and columns corresponding to the number of color change valves. A vertical column control air supply pipe is connected to each row of the air-and elements, and a row-column control air supply pipe is connected to each row of air-and elements of the horizontal column, Two air input terminals of each air and element are connected to a column control air supply pipe and a row control air supply pipe, respectively, and the air output terminals of each air and element are connected to each color change valve, respectively. It is characterized by the presence of

[Effect]

The color change valve opening/closing control mechanism according to the present invention selects specific vertical control air supply pipes and horizontal control air supply pipes and supplies control air to them. Air output is obtained only from the air output terminal of the air AND element to which the air input terminal is connected, and only the color change valve to which the air output terminal is connected is opened.

According to this, it is only necessary to provide the control air supply pipes for vertical rows and the control air supply pipes for horizontal rows for the number of columns and rows of air AND elements arranged in rows and columns. The number of piping and the number of installed electromagnetic switching valves connected to each control air supply pipe are smaller than the total number of air AND elements corresponding to the number of color change valves, so equipment costs and installation space are reduced.

In addition, compared to the case where two-way branch paths are formed in multiple stages in a chain, the entire mechanism can be made smaller and lighter, the response of the color change valve can be improved, and one of the air and Even if there is a failure, there is no problem in that the opening/closing control of the entire color change valve becomes impossible.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described based on the drawings.

Figure 1 is an overall view showing an example of the color change valve opening/closing mechanism according to the present invention, and Figure 2 is an illustration of the air system used for it.
FIG. 3 is a cross-sectional view of an AND element.

In this example, the electrostatic sprayer 1 has a paint hose 2.
Air is output from one air output terminal s only when air is input to both of the two air input terminals a and b, corresponding to the number of color change valves V ₁ to V ₉ connected via. A total of nine air AND elements M ₁ to _{M 9} each having a logic function are arranged in rows of three each in rows and columns.

Air and elements M ₁ , M ₄ and
_M7 , _M2 , _M5 , _M8 , _M3 , _M6 , and _M9 have control air supply pipes for cascade that are collectively connected to the air input terminal a for each row. _E1 ,
E ₂ and E ₃ are provided.

In addition, air and elements M ₁ ,
M ₂ and M ₃ , M ₄ , M ₅ and M ₆ , M ₇ , M ₈ and
_M9 has horizontal row control air supply pipes that are collectively connected to the air input terminal b for each row.
E ₄ , E ₅ and E ₆ are provided.

The air output terminals s of each of these air AND elements M ₁ to _{M 9} are connected to the color change valves V ₁ to _{V 9} , respectively.

Furthermore, each of the control air supply pipes E ₁ to _{E 6} is connected to the color changing valves V ₁ to _{V 9} connected to the electrostatic coating machine 1 to which a high voltage is applied, at a distance that can be electrically insulated. Electromagnetic switching valves D ₁ to _{D 6} that turn on and off the control air are interposed.

Note that the color change valves V ₁ to _{V 7} are connected to the supply sources of each color paint, and the color change valves V ₈ and V ₉ are connected to the supply sources of cleaning air and cleaning thinner, respectively.

In addition, each of the air AND elements M ₁ to _{M 9} has input from air input terminals a and b into an air flow path leading from air input terminals a and b to air output terminal s, as shown in FIG. The valve body 3 is configured to include a valve body 3 that is operated by air, and when air is input from either air input terminal a or b, the valve body 3 receives the air pressure and outputs the air. It freely moves so as to close the air flow path leading to the terminal s, and outputs air from the output terminal s only when air is input from both the air input terminals a and b.

The above is an example of the configuration of the color change valve opening/closing control mechanism according to the present invention, and the operation and effects thereof will be explained next.

First, when painting with, for example, white paint supplied to the color change valve V ₁ , the electromagnetic switching valve D ₁ interposed in the vertical control air supply pipe E ₁ and the horizontal control air supply pipe E Open _{the electromagnetic switching valve D4 installed} in the air AND element M1 to input control air to both air input terminals a and b of the air AND element _M1 .

As a result, control air is output only from the air output terminal s of the air AND element _M1 , and the color change valve _V1 connected to the air output terminal s is opened.
White paint is supplied to the electrostatic sprayer 1 through a paint hose 2.

After the white paint has been painted in this way, if you want to paint with, for example, the red paint supplied to the color change valve _V4 , first apply the solenoid switching valve _D1.
Then, _D4 is closed to stop the output of control air from the air AND element _M1 , and the color change valve _V1 that was supplying white paint is closed.

Next, the electromagnetic switching valve D ₂ interposed in the vertical control air supply pipe E ₂ and the horizontal control air supply pipe
Open electromagnetic switching valve _D6 installed in _E6 to input control air to both air input terminals a and b of air AND element _M8 .

As a result, control air is output from the air output terminal s of the air AND element _M8 , the color change valve _V8 connected to the air output terminal s is opened, and the inside of the paint hose 2 and the electrostatic sprayer 1 are The white paint remaining inside is discharged to the outside by cleaning air supplied from color change valve _V8 .

Next, the electromagnetic switching valve D ₃ installed in the column control air supply pipe E ₃ and the electromagnetic switching valve D ₆ installed in the row control air supply pipe E ₆ are opened. - Input control air to both air input terminals a and b of AND element _M9 .

As a result, control air is output from the air output terminal s of the air AND element M ₉ , the color change valve V ₉ connected to the air output terminal s is opened, and the inside of the paint hose 2 and the electrostatic sprayer 1 are The white paint adhering inside is washed away by the cleaning thinner supplied from the color change valve _V9 .

After that, the color change valve _V8 is opened again using the same operation as above, and the thinner remaining in the paint hose 2 and the electrostatic sprayer 1 is discharged to the outside by the cleaning air supplied from the color change valve _V8 . let

In this way, the inside of the paint hose 2 and the electrostatic sprayer 1 are
When the inside is completely cleaned, the control air supply pipe for the column
Electromagnetic switching valve D ₁ installed in E ₁ and electromagnetic switching valve D ₅ installed in row control air supply pipe E ₅
is opened to input control air to both air input terminals a and b of air AND element _M4 .

As a result, control air is output only from the air output terminal s of the air AND element _M4 , and the color change valve _V4 connected to the air output terminal s is opened.
Red paint from the electrostatic sprayer 1 is supplied from the color change valve V ₄ through the paint hose 2 .

As described above, according to this example, only one combination of vertical and horizontal control air supply pipes E ₁ to E ₃ and row control air supply pipes E ₄ to _{E 6} is selected and each By simply supplying control air to the air AND elements M ₁ to _{M 9} , nine different types of control air are selectively output to control the opening and closing of the nine color change valves V ₁ to _{V 9} . .

Therefore, the number of control air supply pipes E ₁ to _{E 6} and the number of electromagnetic switching valves D ₁ to _{D 6} installed in each of these control air supply pipes E ₁ to E ₆ are determined by the color change valve. Air AND element M ₁ ~ corresponding to the number of V ₁ ~ V ₉
Since the number is smaller than that of _M9 , the equipment cost and installation space of the entire color change valve opening/closing control mechanism are reduced.

In addition, the control air input to each air AND element M ₁ to _{M 9} is output as is to the color change valves V ₁ to V ₉ , so the control air is not formed in multiple stages in a chain as in the conventional example. Compared to the case where each color change valve is supplied through a two-way branch path, the entire mechanism is significantly simpler, smaller and lighter, and the response speed of the color change valves V ₁ to V ₉ becomes extremely fast. .

Furthermore, since the operation of each air and element M ₁ to _{M 9} is not affected by other air and elements, even if any one of the air and elements M ₁ to _{M 9} fails, the color change valve There is no problem that the opening/closing control of all of V ₁ to _{V 9} becomes impossible.

[Effects of the invention] As described above, according to the invention, the number of control air supply pipes and the number of installed electromagnetic switching valves that form the color change valve opening/closing control mechanism are reduced, and the equipment cost of the entire mechanism is reduced. The effect is not only that the installation space is reduced, but also that the entire mechanism is made smaller and lighter by using the air and element, which is itself inexpensive and small, resulting in a significant reduction in equipment costs and installation space. There is.

In addition, the color change valve, which is controlled to open and close using control air, has very good responsiveness and can perform extremely quick color changes. It also has the excellent effect that there is no risk of becoming disabled.

[Brief explanation of the drawing]

Figure 1 is an overall view showing an example of the color change valve opening/closing mechanism according to the present invention, and Figure 2 is an illustration of the air system used for it.
FIG. 3 is a cross-sectional view of an AND element. Explanation of symbols, V ₁ ~ V ₉ ... Color change valve, M ₁ ~
_M9 ...Air AND element, a...Air input terminal,
b...Air input terminal, s...Air output terminal, E ₁
~ _E3 ...Control air supply pipe for vertical rows, _E4 ~ _E6 ...Control air supply pipes for horizontal rows.

Claims (1)

[Scope of utility model registration request] In a color change valve opening/closing control mechanism that selectively opens and closes a large number of color change valves installed in a multicolor painting device using control air, only one color change valve opens and closes when air is input to both of the two air input terminals. Air AND elements having a logical function of outputting air from the air output terminals are arranged in rows and columns in correspondence to the number of color change valves, and each row is arranged with respect to the air AND elements in the vertical row. A control air supply pipe for the column to be connected and a control air supply pipe for the row to be connected for each row to the air AND elements of the horizontal row are provided,
Two air input terminals of each air and element are connected to a column control air supply pipe and a row control air supply pipe, respectively, and the air output terminals of each air and element are connected to each of the color change valves, respectively. A color change valve opening/closing control mechanism.